How can I call a javascript function from inside a method?

Question

I am inside of...

public class bgchange : IMapServerDropDownBoxAction
{
    void IServerAction.ServerAction(ToolbarItemInfo info)
    {
     Some code...

and after "some code" I want to trigger

[WebMethod]
public static void DoSome()
{

}

Which triggers some javascript. Is this possible?

Ok, switch methods here. I was able to call dosome(); which fired but did not trigger the javascript. I have tried to use the registerstartupscript method but don't fully understand how to implement it. Here's what I tried:

public class bgchange : IMapServerDropDownBoxAction
{

void IServerAction.ServerAction(ToolbarItemInfo info)
{
    ...my C# code to perform on dropdown selection...
        //now I want to trigger some javascript...
        // Define the name and type of the client scripts on the page.
        String csname1 = "PopupScript";
        Type cstype = this.GetType();

        // Get a ClientScriptManager reference from the Page class.
        ClientScriptManager cs = Page.ClientScript;

        // Check to see if the startup script is already registered.
        if (!cs.IsStartupScriptRegistered(cstype, csname1))
        {
            String cstext1 = "alert('Hello World');";
            cs.RegisterStartupScript(cstype, csname1, cstext1, true);
        }
}

}

I got the registerstartupscript code from an msdn example. Clearly I am not implementing it correctly. Currently vs says "An object reference is required for the non-static field, method, or property 'System.Web.UI.Page.ClientScript.get' refering to the piece of code "Page.Clientscript;" Thanks.

Answer 1

I'm not sure I fully understand the sequence of what you are trying to do, what's client-side and what's not....

However, you could add a Start-up javascript method to the page which would then call the WebMethod. When calling a WebMethod via javascript, you can add a call-back function, which would then be called when the WebMethod returns.

If you add a ScriptManager tag on your page, you can call WebMethods defined in the page via Javascript.

<asp:ScriptManager ID="scriptManager1" 
    runat="server" EnablePageMethods="true" />

From the Page_Load function you can add a call to your WebMethod..

Page.ClientScript.RegisterStartupScript(
    this.GetType(), 
    "callDoSome",
    "PageMethods.DoSome(Callback_Function, null)", 
    true);

Callback_Function represents a javascript function that will be executed after the WebMethod is called...

<script language="javascript" type="text/javascript">
    function Callback_Function(result, context) {
        alert('WebMethod was called');
    }
</script>

EDIT:

Found this link for Web ADF controls. Is this what you are using??

From that page, it looks like something like this will do a javascript callback.

public void ServerAction(ToolbarItemInfo info) {
    string jsfunction = "alert('Hello');";
    Map mapctrl = (Map)info.BuddyControls[0];
    CallbackResult cr = new CallbackResult(null, null, "javascript", jsfunction);
    mapctrl.CallbackResults.Add(cr);
}